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Influence of roughness on a transparent superhydrophobic coating

Journal of Physical Chemistry C, ISSN: 1932-7447, Vol: 114, Issue: 25, Page: 11228-11233
2010
  • 117
    Citations
  • 0
    Usage
  • 120
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    117
    • Citation Indexes
      117
  • Captures
    120

Article Description

A novel fabrication process is presented using monodisperse PMMA latex particles to facilitate controlled microvoid formation. This results in hierarchically rough surfaces exhibiting ∼90% optical transmission while retaining water contact angle (θ) of 170°. Synchrotron small angle X-ray scattering, AFM roughness measurements, and theoretical modeling suggests that a surface morphology with fractal dimension of ∼2.6 and R < 400 nm allows for the optimum coupling of roughness-induced superhydrophobicity and optical transparency. Interestingly, surfaces of vastly different roughness (R) exhibited similar water contact angles, highlighting a limitation of traditional AFM roughness measurements in quantifying multiscale rough surfaces. An alternate method considering fractal dimension is presented as a more complete quantifier of hierarchical surface morphology in relation to surface wetting behavior. © 2010 American Chemical Society.

Bibliographic Details

Kwun Lun Cho; Irving I. Liaw; Alex H.-F. Wu; Robert N. Lamb

American Chemical Society (ACS)

Materials Science; Energy; Chemistry

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